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BPC-157 compared with TB-500 BPC-157 Research Peptide and TB-500 Research Peptide are often discussed together because both appear in tissue repair research

Pervaiz Iqbal Qureshi, MD Internal Medicine, Medical Director at DripGym Last reviewed June, 2026

Possible side effects include injection-site reactions, headache, nausea, and fatigue typically mild and resolving quickly

However some people may have symptoms of vitamin B12 deficiency despite normal vitamin B12 blood test results, or may have low blood levels despite having no symptoms

25 Patients diagnosed with vitamin B 12 deficiency whose history and physical examination do not suggest an obvious dietary or malabsorptive etiology should be tested for pernicious anemia with anti-intrinsic factor antibodies (positive predictive value = 95%), particularly if other autoimmune disorders are present